130 OPHITTROITiEA. 



a. North-west of Shetland, 345 fins. 'Porcupine ' Exp. (St. 63). 



h. Off S.W. coast of Ireland, 315 fins. ' Flying Fox ' Exp. 



c. Off S.W. coast ol Ireland, 400 fms. G. C. Bourne, Esq. 



Distribution. These are the only known habitats. 



3. 0PHI0MYXA. 



Ophioinyxa, M. Tr. Syst. Ast. (1842) p. 108 ; Lyman, Chall. Rep. Oph. 

 (1882) p. 244. 



Disk and arms covered by a thick skin. Mouth-papillae and teeth 

 flattened lobes, with serrate edges. No tentacle-scales. Arm- 

 spines jagged at tip. 



1. Ophiomyxa serpentaria. 



Ophiomyxa serpentaria,£?/???rm, !>*<//. M.C. Z. x. (1883) p. 274; Hoyle, 

 Pj-oc. Roy. Soc. Ed. xii. (1884) p. 710. 



A single specimen, reported by Lyman from 363 fms. in Faeroe 

 Channel, and distinguished by the absence of upper arm-plates, 

 three short arm-spines, and three small mouth-papilla); radial 

 shields small *. 



CLADOPIIIUBjE (see p. 26). 



ASTRONYCIrOE {see p. 27). 



ASTRONYX. 



Asteronyx, M. Tr. Syst. Ast. (1842) p. 119; Norman, Ami. fy Mag. 



xv. (1865) p. 105. 

 Astronyx, Lyman, Chall. Rep. Oph. (1882) p. 285. 



Disk pentagonal, arched, sharply separated from the narrow 

 arms ; radial shields in the form of elongated rods, but broken into 

 several pieces. Papillaj on the angles of the mouth large ; mouth- 

 shields hidden and small, as is the madreporite. Basal clefts set in 

 a depression, very short, and in the interbrachial angle only. Some 

 of the arm-spines hooked. 



1. Astronyx loveni. 



Asteronyx loveni, M. Tr. Syst. Ast. (1842) p. 119; Sars, Nory. Eck- 

 (1861) p. 5, pi. i. figs. 1-5 ; Stetvart, P. Z. S. 1801, p. 96 (fig.) J 

 Norm. Ann. SrMay. xv. (1805) p. 10(i; Jarzynshy, Trans. Petersb- 

 Soc. Nat. i. (1S70) p. 318 ; Lyman, Chall. Rep. Oph. (1882) 

 p. 137 ; Sim-, Zoologist, xl. (18S2) p. 24 ; Hoyle, Proc. R. Phys. 

 Soc. Ed. viii. (1884) p. 137; id. Proc. Roy. Soc. Ed. xii. (1884) 

 p. 713. 



Arms very long, slender, convex above, flattened below, very fine 

 * No specimen is in the British Museum. 



